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A W TOHMS. SEPARATQR; APPLICATION FILED Nov 12,1915.

Patented Aug. 22, 1916.

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ALBERT W. TOHMS, OF IRON MOUNTAIN, MICHIGAN.

SEPARATOR.

Specification of Letters Patent.

Application filed. November 12, 1915. Serial No. 61,134.

To all whom it may concern Be it known that I, ALBERT 'W. Toni/rs, a citizen of the United States, residing at Iron Mountain, in the county of Dickinson and State of Michigan, have invented new and useful Improvements in Separators, of which the following is a specification.

This invention relates to a separator designed particularly for use in paper making for purpose of separating the pulp from the liquid and passing it on to the paper making machinery.

One object of the invention is to provide a device of the character described whereby an effective degree of separation may be obtained so as to reduce the amount of pulp ordinarily lost by waste, through the pulp passing by the separating roll.

Another object of the invention is to pro vide a separator which obviates the use of a couch roll, and avoids the damage to the screen material of the separating roll caused by the choking of the pulp between the rolls.

A still further object of the invention is to provide a separator which dispenses with the use of vacuum devices or blowers, commonly used for the separation of the pulp from the liquid.

The invention consists of the features of construction, combination and arrangement of parts herein fully described and claimed, reference being had to the accompanying drawings in which Figure 1 is a perspective view of a separator embodying my invention. Fig. 2 is a vertical longitudinal or front to rear section through the same. Fig. 3 is a vertical transverse section on the line 33 of Fig. 2. Fig. 4 is a vertical transverse section on the line 1- 1 of Fig. 2. Fig. 5 is a vertical transverse section on the line 55 of Fig. 2.

In carrying my invention into practice, I provide a separating tank or vat 1, preferably of rectangular or oblong rectangular form, and having a separating compartment 2. The side walls of this compartment 2 are respectively provided with waste water outlets 3 and 4:. At the forward end of the tank or vat, which extends to a higher level than the rear end thereof, is provided an inlet opening 5 for the admission of the pulp, which is introduced in a diluted condition with the Water or carrier liquid after being ground or reduced by a chemical action. This material flows into an elevated inlet or distributing compartment 6, and

thence over a dam or vertical wall 7 into the compartment 2. This dam wall is provided with an inclined rim or coping 8, which is disposed at its outer edge at a higher level than at its inner edge, the surface of said rim or coping sloping downwardly toward the compartment 2. The inlet 5 is controlled by a'vertically sliding gate or door 9, whereby the effective size of said inlet may be governed as desired and arranged within the chamber or compartment 6, in line with the said inlet 5, is a deflector 1Q. This deflector distributes the pulp wlthin the distributing chamber and insures its even distribution toward all portions of the chamber, so that the pulp will flow evenly over the rim or coping of the dam. The pulp and liquid flowing over the top of the dam is deposited upon the surface of a rotary separating drum 11, having an actmg surface 12 of screen material. The upper portion of the periphery of this drum, which turns in a rearward direction or away from the inlet compartment 2, is disposed so as to take up the pulp and water and carry the same rearwardly toward the discharge end of the tank, the water draining from the pulp through the screen surface 12 into the compartment 2, from which it is subsequently discharged, leaving the pulp upon the surface of the screen from which it is discharged into a receiving compartment 13. In practice the drum may be driven by any suitable type of driving mechanism, (not shown). At the ends of the drum 11 are packing disks or washers 3 and 4a which cut 011' communication between the interior of the tank and the waste outlets 3 and 4c and which packing disks or washers have openings affording communication between said outlets and the interior of the drum for the outflow of the water from the drum. Of course, but a single water waste outlet and packing disk need be employed, although the use of both is preferred.

The receiving compartment 13 is formed by the rear end wall of the tank and inner vertical partition wall 14, and said compartment is provided in said rear end wall of the tank with an outlet 15 for the discharge of the pulp and is also provided with inclined side walls 16 which converge downwardly toward the outlet 15 so as to guide the pulp toward said outlet.

In the operation of the device, it will be evident that the pulp entering the distribut- Patented Aug. 22, 1916.

dam wall 7 on to the surface of the screen, will be carried forward toward the receiving compartment by the rotation of the screen, during which the liquid will be separated from the solid pulp, which will be delivered without an excess of moisture into the receiving compartment for discharge through the outlet and delivered to the paper making machine. It will be understood, of course, that the distributing chamber formed by the dam prevents the feeding stock from being agitated by the rotation of the screen drum, and insures the even flow of the stock in a thin film or layer to the drum, so that no interference with the free flow of the material or efiicient separation of the liquid from the pulp will be encountered. Also it will be seen that by the described mode of separating the pulp from the liquid the necessity of employing a couch roll is avoided, and the objections theretoeliminated. Furthermore, a saving is effected, since there is no wear, such as is caused by a couch roll, upon the screen material of the drum, which will accordingly last for a much longer period.

A separator of the character described ing compartment 6 and flowing over the comprising a separating chamber, a rotary screen drum arranged within said chamber, a receiving chamber arranged in advance of the drum and substantially below the hori zontal center thereof, and adapted to receive the material from the periphery of the drum, said receiving chamber being provided with an outlet below the level of the top thereof, a distributing chamber arranged in rear and above the horizontal center of the drum and having an inlet at its outer side, said distributing chamber being provided with a transversely extending imperforate bar at its inner side forming a stationary dam wall having a concaved inner surface arranged to overhang a portion of the peripheryof the drum and hav ing an upper surface sloping downwardly and inwardly from its upper rear edge toward the drum, and means for controlling the supply of the material through said inlet.

In testimony whereof I affiX my signature in presence of two witnesses.

ALBERT W. TOHMS. Witnesses:

JAMES H. RAFTER, JOEL D. JoNEs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

